[GHC] #8072: Optimizations change result of div for Word

[GHC]

#8072: Optimizations change result of div for Word
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        Reporter:  Khudyakov         |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  x86
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  3676
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Comment (by jstolarek):

 And I can confirm that this happens in HEAD on 32 bits, but not on 64
 bits.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8072#comment:4>
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